<template>
  <div id="app">
    <router-view></router-view>
  </div>
</template>
<script>
export default {
  name: 'App',
  created() {
    // 在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem('store')) {
      this.$store.replaceState(
          Object.assign(
              {},
              this.$store.state,
              JSON.parse(sessionStorage.getItem('store'))
          )
      )
      if (this.$store.state.user != null) {
        // createSocket(`${constant.websocketUrlPrefix}/${this.$store.state.user.userName}`)
      }
    }
    // 在页面刷新时将vuex里的信息保存到sessionStorage里
    // beforeunload事件在页面刷新时先触发
    window.addEventListener('beforeunload', () => {
      sessionStorage.setItem('store', JSON.stringify(this.$store.state))
    })
  }
}
</script>

<style>
* {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
}

#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
}
</style>
